it's deep for what they're willing to do for the cities. pm 2.5 isstandard for 35 micrograms per cubic meter. registered as high as 900. the goals are now to get down the levels that the u.s. and world health organization need to be phased down. the challenge is enormous. ot just about coal-fired power plants. it's about the industries and about using as many creative they can, learning from our experience. about how to get there. >> one of the issues that there seems to have been some progress dialogue, the our u.s. dialogue with china is the agency, for example. so i'm curious about some of the what we call short lived emissions. gas is it carbon is associated with the cook stoves. >> it is. >> do you see opportunities there? >> we do. and we're exploring those. one of the reasons to get is to look at what we've done over the past two years and set a course -- actually, three, and set a course for the next couple. been working with china on a range of things. methane, as well as other traditional pollute tants and co-2. looking -- they've